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a5b79d62 | 1 | /* |
2 | * max6639.c - Support for Maxim MAX6639 | |
3 | * | |
4 | * 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller | |
5 | * | |
6 | * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de> | |
7 | * | |
8 | * based on the initial MAX6639 support from semptian.net | |
9 | * by He Changqing <hechangqing@semptian.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 | */ | |
25 | ||
26 | #include <linux/module.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/jiffies.h> | |
30 | #include <linux/i2c.h> | |
31 | #include <linux/hwmon.h> | |
32 | #include <linux/hwmon-sysfs.h> | |
33 | #include <linux/err.h> | |
34 | #include <linux/mutex.h> | |
35 | #include <linux/i2c/max6639.h> | |
36 | ||
37 | /* Addresses to scan */ | |
38 | static unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END }; | |
39 | ||
40 | /* The MAX6639 registers, valid channel numbers: 0, 1 */ | |
41 | #define MAX6639_REG_TEMP(ch) (0x00 + (ch)) | |
42 | #define MAX6639_REG_STATUS 0x02 | |
43 | #define MAX6639_REG_OUTPUT_MASK 0x03 | |
44 | #define MAX6639_REG_GCONFIG 0x04 | |
45 | #define MAX6639_REG_TEMP_EXT(ch) (0x05 + (ch)) | |
46 | #define MAX6639_REG_ALERT_LIMIT(ch) (0x08 + (ch)) | |
47 | #define MAX6639_REG_OT_LIMIT(ch) (0x0A + (ch)) | |
48 | #define MAX6639_REG_THERM_LIMIT(ch) (0x0C + (ch)) | |
49 | #define MAX6639_REG_FAN_CONFIG1(ch) (0x10 + (ch) * 4) | |
50 | #define MAX6639_REG_FAN_CONFIG2a(ch) (0x11 + (ch) * 4) | |
51 | #define MAX6639_REG_FAN_CONFIG2b(ch) (0x12 + (ch) * 4) | |
52 | #define MAX6639_REG_FAN_CONFIG3(ch) (0x13 + (ch) * 4) | |
53 | #define MAX6639_REG_FAN_CNT(ch) (0x20 + (ch)) | |
54 | #define MAX6639_REG_TARGET_CNT(ch) (0x22 + (ch)) | |
55 | #define MAX6639_REG_FAN_PPR(ch) (0x24 + (ch)) | |
56 | #define MAX6639_REG_TARGTDUTY(ch) (0x26 + (ch)) | |
57 | #define MAX6639_REG_FAN_START_TEMP(ch) (0x28 + (ch)) | |
58 | #define MAX6639_REG_DEVID 0x3D | |
59 | #define MAX6639_REG_MANUID 0x3E | |
60 | #define MAX6639_REG_DEVREV 0x3F | |
61 | ||
62 | /* Register bits */ | |
63 | #define MAX6639_GCONFIG_STANDBY 0x80 | |
64 | #define MAX6639_GCONFIG_POR 0x40 | |
65 | #define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20 | |
66 | #define MAX6639_GCONFIG_CH2_LOCAL 0x10 | |
177f3b92 | 67 | #define MAX6639_GCONFIG_PWM_FREQ_HI 0x08 |
a5b79d62 | 68 | |
69 | #define MAX6639_FAN_CONFIG1_PWM 0x80 | |
70 | ||
177f3b92 | 71 | #define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40 |
72 | ||
a5b79d62 | 73 | static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 }; |
74 | ||
75 | #define FAN_FROM_REG(val, div, rpm_range) ((val) == 0 ? -1 : \ | |
76 | (val) == 255 ? 0 : (rpm_ranges[rpm_range] * 30) / ((div + 1) * (val))) | |
77 | #define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val) / 1000, 0, 255) | |
78 | ||
79 | /* | |
80 | * Client data (each client gets its own) | |
81 | */ | |
82 | struct max6639_data { | |
83 | struct device *hwmon_dev; | |
84 | struct mutex update_lock; | |
85 | char valid; /* !=0 if following fields are valid */ | |
86 | unsigned long last_updated; /* In jiffies */ | |
87 | ||
88 | /* Register values sampled regularly */ | |
89 | u16 temp[2]; /* Temperature, in 1/8 C, 0..255 C */ | |
90 | bool temp_fault[2]; /* Detected temperature diode failure */ | |
91 | u8 fan[2]; /* Register value: TACH count for fans >=30 */ | |
92 | u8 status; /* Detected channel alarms and fan failures */ | |
93 | ||
94 | /* Register values only written to */ | |
95 | u8 pwm[2]; /* Register value: Duty cycle 0..120 */ | |
96 | u8 temp_therm[2]; /* THERM Temperature, 0..255 C (->_max) */ | |
97 | u8 temp_alert[2]; /* ALERT Temperature, 0..255 C (->_crit) */ | |
98 | u8 temp_ot[2]; /* OT Temperature, 0..255 C (->_emergency) */ | |
99 | ||
100 | /* Register values initialized only once */ | |
101 | u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */ | |
102 | u8 rpm_range; /* Index in above rpm_ranges table */ | |
103 | }; | |
104 | ||
105 | static struct max6639_data *max6639_update_device(struct device *dev) | |
106 | { | |
107 | struct i2c_client *client = to_i2c_client(dev); | |
108 | struct max6639_data *data = i2c_get_clientdata(client); | |
109 | struct max6639_data *ret = data; | |
110 | int i; | |
111 | int status_reg; | |
112 | ||
113 | mutex_lock(&data->update_lock); | |
114 | ||
115 | if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { | |
116 | int res; | |
117 | ||
118 | dev_dbg(&client->dev, "Starting max6639 update\n"); | |
119 | ||
120 | status_reg = i2c_smbus_read_byte_data(client, | |
121 | MAX6639_REG_STATUS); | |
122 | if (status_reg < 0) { | |
123 | ret = ERR_PTR(status_reg); | |
124 | goto abort; | |
125 | } | |
126 | ||
127 | data->status = status_reg; | |
128 | ||
129 | for (i = 0; i < 2; i++) { | |
130 | res = i2c_smbus_read_byte_data(client, | |
131 | MAX6639_REG_FAN_CNT(i)); | |
132 | if (res < 0) { | |
133 | ret = ERR_PTR(res); | |
134 | goto abort; | |
135 | } | |
136 | data->fan[i] = res; | |
137 | ||
138 | res = i2c_smbus_read_byte_data(client, | |
139 | MAX6639_REG_TEMP_EXT(i)); | |
140 | if (res < 0) { | |
141 | ret = ERR_PTR(res); | |
142 | goto abort; | |
143 | } | |
144 | data->temp[i] = res >> 5; | |
145 | data->temp_fault[i] = res & 0x01; | |
146 | ||
147 | res = i2c_smbus_read_byte_data(client, | |
148 | MAX6639_REG_TEMP(i)); | |
149 | if (res < 0) { | |
150 | ret = ERR_PTR(res); | |
151 | goto abort; | |
152 | } | |
153 | data->temp[i] |= res << 3; | |
154 | } | |
155 | ||
156 | data->last_updated = jiffies; | |
157 | data->valid = 1; | |
158 | } | |
159 | abort: | |
160 | mutex_unlock(&data->update_lock); | |
161 | ||
162 | return ret; | |
163 | } | |
164 | ||
165 | static ssize_t show_temp_input(struct device *dev, | |
166 | struct device_attribute *dev_attr, char *buf) | |
167 | { | |
168 | long temp; | |
169 | struct max6639_data *data = max6639_update_device(dev); | |
170 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
171 | ||
172 | if (IS_ERR(data)) | |
173 | return PTR_ERR(data); | |
174 | ||
175 | temp = data->temp[attr->index] * 125; | |
176 | return sprintf(buf, "%ld\n", temp); | |
177 | } | |
178 | ||
179 | static ssize_t show_temp_fault(struct device *dev, | |
180 | struct device_attribute *dev_attr, char *buf) | |
181 | { | |
182 | struct max6639_data *data = max6639_update_device(dev); | |
183 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
184 | ||
185 | if (IS_ERR(data)) | |
186 | return PTR_ERR(data); | |
187 | ||
188 | return sprintf(buf, "%d\n", data->temp_fault[attr->index]); | |
189 | } | |
190 | ||
191 | static ssize_t show_temp_max(struct device *dev, | |
192 | struct device_attribute *dev_attr, char *buf) | |
193 | { | |
194 | struct i2c_client *client = to_i2c_client(dev); | |
195 | struct max6639_data *data = i2c_get_clientdata(client); | |
196 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
197 | ||
198 | return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000)); | |
199 | } | |
200 | ||
201 | static ssize_t set_temp_max(struct device *dev, | |
202 | struct device_attribute *dev_attr, | |
203 | const char *buf, size_t count) | |
204 | { | |
205 | struct i2c_client *client = to_i2c_client(dev); | |
206 | struct max6639_data *data = i2c_get_clientdata(client); | |
207 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
208 | unsigned long val; | |
209 | int res; | |
210 | ||
211 | res = strict_strtoul(buf, 10, &val); | |
212 | if (res) | |
213 | return res; | |
214 | ||
215 | mutex_lock(&data->update_lock); | |
216 | data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val); | |
217 | i2c_smbus_write_byte_data(client, | |
218 | MAX6639_REG_THERM_LIMIT(attr->index), | |
219 | data->temp_therm[attr->index]); | |
220 | mutex_unlock(&data->update_lock); | |
221 | return count; | |
222 | } | |
223 | ||
224 | static ssize_t show_temp_crit(struct device *dev, | |
225 | struct device_attribute *dev_attr, char *buf) | |
226 | { | |
227 | struct i2c_client *client = to_i2c_client(dev); | |
228 | struct max6639_data *data = i2c_get_clientdata(client); | |
229 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
230 | ||
231 | return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000)); | |
232 | } | |
233 | ||
234 | static ssize_t set_temp_crit(struct device *dev, | |
235 | struct device_attribute *dev_attr, | |
236 | const char *buf, size_t count) | |
237 | { | |
238 | struct i2c_client *client = to_i2c_client(dev); | |
239 | struct max6639_data *data = i2c_get_clientdata(client); | |
240 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
241 | unsigned long val; | |
242 | int res; | |
243 | ||
244 | res = strict_strtoul(buf, 10, &val); | |
245 | if (res) | |
246 | return res; | |
247 | ||
248 | mutex_lock(&data->update_lock); | |
249 | data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val); | |
250 | i2c_smbus_write_byte_data(client, | |
251 | MAX6639_REG_ALERT_LIMIT(attr->index), | |
252 | data->temp_alert[attr->index]); | |
253 | mutex_unlock(&data->update_lock); | |
254 | return count; | |
255 | } | |
256 | ||
257 | static ssize_t show_temp_emergency(struct device *dev, | |
258 | struct device_attribute *dev_attr, | |
259 | char *buf) | |
260 | { | |
261 | struct i2c_client *client = to_i2c_client(dev); | |
262 | struct max6639_data *data = i2c_get_clientdata(client); | |
263 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
264 | ||
265 | return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000)); | |
266 | } | |
267 | ||
268 | static ssize_t set_temp_emergency(struct device *dev, | |
269 | struct device_attribute *dev_attr, | |
270 | const char *buf, size_t count) | |
271 | { | |
272 | struct i2c_client *client = to_i2c_client(dev); | |
273 | struct max6639_data *data = i2c_get_clientdata(client); | |
274 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
275 | unsigned long val; | |
276 | int res; | |
277 | ||
278 | res = strict_strtoul(buf, 10, &val); | |
279 | if (res) | |
280 | return res; | |
281 | ||
282 | mutex_lock(&data->update_lock); | |
283 | data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val); | |
284 | i2c_smbus_write_byte_data(client, | |
285 | MAX6639_REG_OT_LIMIT(attr->index), | |
286 | data->temp_ot[attr->index]); | |
287 | mutex_unlock(&data->update_lock); | |
288 | return count; | |
289 | } | |
290 | ||
291 | static ssize_t show_pwm(struct device *dev, | |
292 | struct device_attribute *dev_attr, char *buf) | |
293 | { | |
294 | struct i2c_client *client = to_i2c_client(dev); | |
295 | struct max6639_data *data = i2c_get_clientdata(client); | |
296 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
297 | ||
298 | return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120); | |
299 | } | |
300 | ||
301 | static ssize_t set_pwm(struct device *dev, | |
302 | struct device_attribute *dev_attr, | |
303 | const char *buf, size_t count) | |
304 | { | |
305 | struct i2c_client *client = to_i2c_client(dev); | |
306 | struct max6639_data *data = i2c_get_clientdata(client); | |
307 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
308 | unsigned long val; | |
309 | int res; | |
310 | ||
311 | res = strict_strtoul(buf, 10, &val); | |
312 | if (res) | |
313 | return res; | |
314 | ||
315 | val = SENSORS_LIMIT(val, 0, 255); | |
316 | ||
317 | mutex_lock(&data->update_lock); | |
318 | data->pwm[attr->index] = (u8)(val * 120 / 255); | |
319 | i2c_smbus_write_byte_data(client, | |
320 | MAX6639_REG_TARGTDUTY(attr->index), | |
321 | data->pwm[attr->index]); | |
322 | mutex_unlock(&data->update_lock); | |
323 | return count; | |
324 | } | |
325 | ||
326 | static ssize_t show_fan_input(struct device *dev, | |
327 | struct device_attribute *dev_attr, char *buf) | |
328 | { | |
329 | struct max6639_data *data = max6639_update_device(dev); | |
330 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
331 | ||
332 | if (IS_ERR(data)) | |
333 | return PTR_ERR(data); | |
334 | ||
335 | return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index], | |
336 | data->ppr, data->rpm_range)); | |
337 | } | |
338 | ||
339 | static ssize_t show_alarm(struct device *dev, | |
340 | struct device_attribute *dev_attr, char *buf) | |
341 | { | |
342 | struct max6639_data *data = max6639_update_device(dev); | |
343 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
344 | ||
345 | if (IS_ERR(data)) | |
346 | return PTR_ERR(data); | |
347 | ||
348 | return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index))); | |
349 | } | |
350 | ||
351 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0); | |
352 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1); | |
353 | static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0); | |
354 | static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1); | |
355 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, | |
356 | set_temp_max, 0); | |
357 | static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max, | |
358 | set_temp_max, 1); | |
359 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit, | |
360 | set_temp_crit, 0); | |
361 | static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit, | |
362 | set_temp_crit, 1); | |
363 | static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO, | |
364 | show_temp_emergency, set_temp_emergency, 0); | |
365 | static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO, | |
366 | show_temp_emergency, set_temp_emergency, 1); | |
367 | static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 0); | |
368 | static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 1); | |
369 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0); | |
370 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1); | |
371 | static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_alarm, NULL, 1); | |
372 | static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_alarm, NULL, 0); | |
373 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 3); | |
374 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 2); | |
375 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 7); | |
376 | static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 6); | |
377 | static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 5); | |
378 | static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 4); | |
379 | ||
380 | ||
381 | static struct attribute *max6639_attributes[] = { | |
382 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
383 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
384 | &sensor_dev_attr_temp1_fault.dev_attr.attr, | |
385 | &sensor_dev_attr_temp2_fault.dev_attr.attr, | |
386 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
387 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
388 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
389 | &sensor_dev_attr_temp2_crit.dev_attr.attr, | |
390 | &sensor_dev_attr_temp1_emergency.dev_attr.attr, | |
391 | &sensor_dev_attr_temp2_emergency.dev_attr.attr, | |
392 | &sensor_dev_attr_pwm1.dev_attr.attr, | |
393 | &sensor_dev_attr_pwm2.dev_attr.attr, | |
394 | &sensor_dev_attr_fan1_input.dev_attr.attr, | |
395 | &sensor_dev_attr_fan2_input.dev_attr.attr, | |
396 | &sensor_dev_attr_fan1_fault.dev_attr.attr, | |
397 | &sensor_dev_attr_fan2_fault.dev_attr.attr, | |
398 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
399 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | |
400 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
401 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, | |
402 | &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr, | |
403 | &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr, | |
404 | NULL | |
405 | }; | |
406 | ||
407 | static const struct attribute_group max6639_group = { | |
408 | .attrs = max6639_attributes, | |
409 | }; | |
410 | ||
411 | /* | |
412 | * returns respective index in rpm_ranges table | |
413 | * 1 by default on invalid range | |
414 | */ | |
415 | static int rpm_range_to_reg(int range) | |
416 | { | |
417 | int i; | |
418 | ||
419 | for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) { | |
420 | if (rpm_ranges[i] == range) | |
421 | return i; | |
422 | } | |
423 | ||
424 | return 1; /* default: 4000 RPM */ | |
425 | } | |
426 | ||
427 | static int max6639_init_client(struct i2c_client *client) | |
428 | { | |
429 | struct max6639_data *data = i2c_get_clientdata(client); | |
430 | struct max6639_platform_data *max6639_info = | |
431 | client->dev.platform_data; | |
432 | int i = 0; | |
433 | int rpm_range = 1; /* default: 4000 RPM */ | |
434 | int err = 0; | |
435 | ||
177f3b92 | 436 | /* Reset chip to default values, see below for GCONFIG setup */ |
a5b79d62 | 437 | err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, |
438 | MAX6639_GCONFIG_POR); | |
439 | if (err) | |
440 | goto exit; | |
441 | ||
442 | /* Fans pulse per revolution is 2 by default */ | |
443 | if (max6639_info && max6639_info->ppr > 0 && | |
444 | max6639_info->ppr < 5) | |
445 | data->ppr = max6639_info->ppr; | |
446 | else | |
447 | data->ppr = 2; | |
448 | data->ppr -= 1; | |
449 | err = i2c_smbus_write_byte_data(client, | |
450 | MAX6639_REG_FAN_PPR(i), | |
451 | data->ppr << 5); | |
452 | if (err) | |
453 | goto exit; | |
454 | ||
455 | if (max6639_info) | |
456 | rpm_range = rpm_range_to_reg(max6639_info->rpm_range); | |
457 | data->rpm_range = rpm_range; | |
458 | ||
459 | for (i = 0; i < 2; i++) { | |
460 | ||
461 | /* Fans config PWM, RPM */ | |
462 | err = i2c_smbus_write_byte_data(client, | |
463 | MAX6639_REG_FAN_CONFIG1(i), | |
464 | MAX6639_FAN_CONFIG1_PWM | rpm_range); | |
465 | if (err) | |
466 | goto exit; | |
467 | ||
468 | /* Fans PWM polarity high by default */ | |
469 | if (max6639_info && max6639_info->pwm_polarity == 0) | |
470 | err = i2c_smbus_write_byte_data(client, | |
471 | MAX6639_REG_FAN_CONFIG2a(i), 0x00); | |
472 | else | |
473 | err = i2c_smbus_write_byte_data(client, | |
474 | MAX6639_REG_FAN_CONFIG2a(i), 0x02); | |
475 | if (err) | |
476 | goto exit; | |
477 | ||
177f3b92 | 478 | /* |
479 | * /THERM full speed enable, | |
480 | * PWM frequency 25kHz, see also GCONFIG below | |
481 | */ | |
482 | err = i2c_smbus_write_byte_data(client, | |
483 | MAX6639_REG_FAN_CONFIG3(i), | |
484 | MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03); | |
485 | if (err) | |
486 | goto exit; | |
487 | ||
a5b79d62 | 488 | /* Max. temp. 80C/90C/100C */ |
489 | data->temp_therm[i] = 80; | |
490 | data->temp_alert[i] = 90; | |
491 | data->temp_ot[i] = 100; | |
492 | err = i2c_smbus_write_byte_data(client, | |
493 | MAX6639_REG_THERM_LIMIT(i), | |
494 | data->temp_therm[i]); | |
495 | if (err) | |
496 | goto exit; | |
497 | err = i2c_smbus_write_byte_data(client, | |
498 | MAX6639_REG_ALERT_LIMIT(i), | |
499 | data->temp_alert[i]); | |
500 | if (err) | |
501 | goto exit; | |
502 | err = i2c_smbus_write_byte_data(client, | |
503 | MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]); | |
504 | if (err) | |
505 | goto exit; | |
506 | ||
507 | /* PWM 120/120 (i.e. 100%) */ | |
508 | data->pwm[i] = 120; | |
509 | err = i2c_smbus_write_byte_data(client, | |
510 | MAX6639_REG_TARGTDUTY(i), data->pwm[i]); | |
511 | if (err) | |
512 | goto exit; | |
513 | } | |
514 | /* Start monitoring */ | |
515 | err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, | |
177f3b92 | 516 | MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL | |
517 | MAX6639_GCONFIG_PWM_FREQ_HI); | |
a5b79d62 | 518 | exit: |
519 | return err; | |
520 | } | |
521 | ||
522 | /* Return 0 if detection is successful, -ENODEV otherwise */ | |
523 | static int max6639_detect(struct i2c_client *client, | |
524 | struct i2c_board_info *info) | |
525 | { | |
526 | struct i2c_adapter *adapter = client->adapter; | |
527 | int dev_id, manu_id; | |
528 | ||
529 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
530 | return -ENODEV; | |
531 | ||
532 | /* Actual detection via device and manufacturer ID */ | |
533 | dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID); | |
534 | manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID); | |
535 | if (dev_id != 0x58 || manu_id != 0x4D) | |
536 | return -ENODEV; | |
537 | ||
538 | strlcpy(info->type, "max6639", I2C_NAME_SIZE); | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | static int max6639_probe(struct i2c_client *client, | |
544 | const struct i2c_device_id *id) | |
545 | { | |
546 | struct max6639_data *data; | |
547 | int err; | |
548 | ||
549 | data = kzalloc(sizeof(struct max6639_data), GFP_KERNEL); | |
550 | if (!data) { | |
551 | err = -ENOMEM; | |
552 | goto exit; | |
553 | } | |
554 | ||
555 | i2c_set_clientdata(client, data); | |
556 | mutex_init(&data->update_lock); | |
557 | ||
558 | /* Initialize the max6639 chip */ | |
559 | err = max6639_init_client(client); | |
560 | if (err < 0) | |
561 | goto error_free; | |
562 | ||
563 | /* Register sysfs hooks */ | |
564 | err = sysfs_create_group(&client->dev.kobj, &max6639_group); | |
565 | if (err) | |
566 | goto error_free; | |
567 | ||
568 | data->hwmon_dev = hwmon_device_register(&client->dev); | |
569 | if (IS_ERR(data->hwmon_dev)) { | |
570 | err = PTR_ERR(data->hwmon_dev); | |
571 | goto error_remove; | |
572 | } | |
573 | ||
574 | dev_info(&client->dev, "temperature sensor and fan control found\n"); | |
575 | ||
576 | return 0; | |
577 | ||
578 | error_remove: | |
579 | sysfs_remove_group(&client->dev.kobj, &max6639_group); | |
580 | error_free: | |
581 | kfree(data); | |
582 | exit: | |
583 | return err; | |
584 | } | |
585 | ||
586 | static int max6639_remove(struct i2c_client *client) | |
587 | { | |
588 | struct max6639_data *data = i2c_get_clientdata(client); | |
589 | ||
590 | hwmon_device_unregister(data->hwmon_dev); | |
591 | sysfs_remove_group(&client->dev.kobj, &max6639_group); | |
592 | ||
593 | kfree(data); | |
594 | return 0; | |
595 | } | |
596 | ||
597 | static int max6639_suspend(struct i2c_client *client, pm_message_t mesg) | |
598 | { | |
599 | int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); | |
600 | if (data < 0) | |
601 | return data; | |
602 | ||
603 | return i2c_smbus_write_byte_data(client, | |
604 | MAX6639_REG_GCONFIG, data | MAX6639_GCONFIG_STANDBY); | |
605 | } | |
606 | ||
607 | static int max6639_resume(struct i2c_client *client) | |
608 | { | |
609 | int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); | |
610 | if (data < 0) | |
611 | return data; | |
612 | ||
613 | return i2c_smbus_write_byte_data(client, | |
614 | MAX6639_REG_GCONFIG, data & ~MAX6639_GCONFIG_STANDBY); | |
615 | } | |
616 | ||
617 | static const struct i2c_device_id max6639_id[] = { | |
618 | {"max6639", 0}, | |
619 | { } | |
620 | }; | |
621 | ||
622 | MODULE_DEVICE_TABLE(i2c, max6639_id); | |
623 | ||
624 | static struct i2c_driver max6639_driver = { | |
625 | .class = I2C_CLASS_HWMON, | |
626 | .driver = { | |
627 | .name = "max6639", | |
628 | }, | |
629 | .probe = max6639_probe, | |
630 | .remove = max6639_remove, | |
631 | .suspend = max6639_suspend, | |
632 | .resume = max6639_resume, | |
633 | .id_table = max6639_id, | |
634 | .detect = max6639_detect, | |
635 | .address_list = normal_i2c, | |
636 | }; | |
637 | ||
638 | static int __init max6639_init(void) | |
639 | { | |
640 | return i2c_add_driver(&max6639_driver); | |
641 | } | |
642 | ||
643 | static void __exit max6639_exit(void) | |
644 | { | |
645 | i2c_del_driver(&max6639_driver); | |
646 | } | |
647 | ||
648 | MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>"); | |
649 | MODULE_DESCRIPTION("max6639 driver"); | |
650 | MODULE_LICENSE("GPL"); | |
651 | ||
652 | module_init(max6639_init); | |
653 | module_exit(max6639_exit); |